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1 Site Background Information - Ripon Farm Service <br /> Page 5 of 9 <br /> 1 <br /> range of petroleum hydrocarbons <br /> ' On 13 May 1998 five soil borings gs were drilled on-site (B 18 and B 19) and off-site (B20 through <br /> ' B22)with three off-site borings completed as ground water monitoring wells (MW-6, MW-7, and <br /> MW-8), the two on-sate borings were dual-completed as remediation pilot-test wells VW-I and <br /> VW-2 Saturated soil conditions were encountered in all borings at a depth of approximately <br /> ' 17 feet bsg <br /> • TPH-g was detected in two out of eleven analyzed soil samples collected from borings B 18 <br /> ' through B21, BTEX was detected in five of the samples The greatest concentrations of <br /> TPH-g and TPH-d detected were 440 mg/kg and 1,400 mg/kg,respectively, encountered in <br /> sample B19-20 Toluene,ethylbenzene,and total xylenes were detected in the soil samples <br /> at concentrations as great as 8 6 mg/kg(xylenes) Oxygenated compounds were not detected <br /> in the soil samples analyzed Volatile organic compounds (VOCs) were detected in soil <br /> samples collected at vanable concentrations <br /> ' • Soil samples collected from the Jimco Truck Stop at depths of 20 feet bsg were Impacted <br /> with TPH-d at concentrations as high as 490 mg/kg, and xylenes at concentrations as high <br /> as 0 017 mg/kg <br /> • Naphthalene was detected at a concentration of 2,600 micrograms per kilogram(gg/kg) The <br /> VOC encountered at the greatest concentration in the soil samples was 1,3,5- <br /> ' trimethylbenzene, which was detected at a concentration of 12,000 gg/kg <br /> Quarterly monitoring events have been conducted at the site since the first ground water monitoring <br /> wells were installed in April 1994 The general results of the ground water monitoring events are <br /> as follows <br /> ' TPH-g has been detected in ground water samples collected from wells MW-1 though <br /> MW-10 at concentrations as high as 420,000 µg/l TPH-d has been detected at <br /> ' concentrations as high as 210,000 µg/1 TPH-g and TPH-d have been detected in ground <br /> water samples collected from soil vapor wells (VW-1 and VW-2) at concentrations as high <br /> as 76,000 gg/l and 290,000 gg/l, respectively TPH-d concentrations typically exceeded <br /> ' TPH-g concentrations in the samples containing both analytes <br /> • Benzene has been detected in the samples from wells MW-1 through MW-6, VW-1, and <br /> ' VW-2 at concentrations as high as 2,000 gg/l (VW-]A) Toluene has been detected in the <br /> samples from wells MW-1 through MW-7, VW-1, and VW-2 at concentrations as high as <br /> 130 gg/l(MW-2) Ethylbenzene has been detected in the samples from wells MW-1 through <br />' MW-6, VW-1, and VW-2 at concentrations as high as 870 µg/1 (VW-IA) Xylenes have <br /> been detected in the samples from wells MW-1 through MW-8, VW-1, and VW-2 at <br /> • concentrations as high as 1,700µg/l (MW-2) <br /> 1 <br /> Advanced Geornvironmentall,Inc <br /> 1 <br />